Sound Reproducing Apparatus
A sound reproducing apparatus is structured to use a first dividing circuit and a determining circuit to analyze a frequency characteristic of an inputted signal and to output a signal adjusted by a first adjusting circuit to have a prescribed frequency characteristic by a switching by a switch circuit. Thus, when signals having different frequency characteristics are inputted, frequency characteristics of the input signals can be automatically adjusted without using an external signal and channels having different frequency characteristics can be reproduced by a single system to provide good speaker-reproduced sound.
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The present invention relates to a sound reproducing apparatus that can reproduce channels in which sounds having different frequency characteristics are recorded (e.g., woofer channels for CD and DVD) under a single acoustic field environment and with a good sound quality.
BACKGROUND ARTJapanese Patent Unexamined Publication No. 2001-112098 discloses a technique for a conventional sound reproducing apparatus. When this technique is used to reproduce a two channel source such as CD and a multi channel source including a woofer channel such as DVD in which only a low frequency is recorded under a single acoustic field reproducing environment, a switch is used to provide a switching between a two channel signal line and a multi channel signal line.
However, a sound reproducing apparatus having the conventional structure as described above has required an external signal for making distinction between a two channel and a multi channel when a switching between signals is performed.
SUMMARY OF THE INVENTIONA sound reproducing apparatus includes: a music signal source; a dividing circuit formed of at least one filter for dividing the music signal source into prescribed bands; a determining circuit for determining, based on an output from the dividing circuit, a frequency included in the music signal source; an adjusting circuit formed of at least one filter for adjusting the music signal source to have a prescribed frequency characteristic; and a switch circuit for switching an output of the adjusting circuit. An output from the determining circuit is used to control the switch circuit to output a signal adjusted to have a prescribed frequency characteristic.
The structure as described above allows, when channels having different frequency characteristics (e.g., a two channel source (e.g., CD) and a multi channel source (e.g., DVD)) are reproduced, the frequency characteristics of the music signal source themselves can be used to switch signal lines to adjust the multi channel source to have a prescribed frequency characteristic. As a result, when channels having different frequency characteristics (e.g., a woofer channel of DVD and CD) are reproduced by a single system, good speaker-reproduced sound can be realized.
11 Music signal source
12 First dividing circuit
13 Second dividing circuit
14 First adjusting circuit
15 Second adjusting circuit
16 Determining circuit
17 Switch circuit
20 Output signal
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTSHereinafter, an embodiment of the present invention will be described with reference to
As shown in
Next, an operation of the sound reproducing apparatus in Embodiment 1 having the structure as described above will be described with reference to
When the sound reproducing apparatus in Embodiment 1 receives a signal as music signal source 11 including a high frequency component of a certain level or more as shown in
Although Embodiment 1 has used a high-pass filter as first dividing circuit 12, a similar control also can be performed by another structure such as a combination of a band-pass filter and another filter so that music signal source 11 can be divided into prescribed bands.
Embodiment 2A sound reproducing apparatus in Embodiment 2 is characterized in that Embodiment 1 of the present invention is added with a second dividing circuit and a plurality of dividing circuits are used to improve an accuracy at which a frequency characteristic is determined by the determining circuit.
As shown in
Next, the operation of the sound reproducing apparatus in Embodiment 2 having the structure as described above will be described.
The sound reproducing apparatus in Embodiment 2 uses the structure having a plurality of dividing circuits so that first dividing circuit 12 uses a low-pass filter for extracting only a low frequency and second dividing circuit 13 uses a high-pass filter for extracting only a high frequency for example. Then, signal levels of frequency components as output results extracted by first dividing circuit 12 and second dividing circuit 13 are determined by determining circuit 16 using an absolute value circuit and a comparator or a wind comparator with regards to whether the signal levels are equal to or higher than a certain level. In this manner, only when music signal source 11 as shown in
A sound reproducing apparatus in Embodiment 3 is characterized in that Embodiment 2 of the present invention is added with a second adjusting circuit to use a plurality of adjusting circuits.
As shown in
Next, the operation of the sound reproducing apparatus in Embodiment 3 having the structure as described above will be described.
The sound reproducing apparatus in Embodiment 3 can perform a control by using the similar determination results as in Embodiments 1 and 2. The sound reproducing apparatus in Embodiment 3 also can subject, when music signal source 11 includes only a low frequency component, the signal to a signal processing in which the signal is provided with an optimal frequency characteristic. The sound reproducing apparatus in Embodiment 3 also can subject, when music signal source 11 includes both of a low frequency component and a high frequency component, the signal to a signal processing for specific optimization in which the signal is provided with an optimal frequency characteristic.
For example, when music signal source 11 includes only a low frequency component for example, the signal processing in Embodiment 3 uses first adjusting circuit 14 to reduce the bandwidth of the signal so that only a signal having a further lower frequency component can be used. When music signal source 11 includes both of a low frequency component and a high frequency component, second adjusting circuit 15 can subject the signal to a signal processing for reducing the bandwidth to a similar bandwidth. In this manner, frequency characteristics of first adjusting circuit 14 and second adjusting circuit 15 can be respectively adjusted so as to have a prescribed frequency characteristic and are appropriately switched, thus realizing a favorable sound reproduction.
Although Embodiment 3 includes a plurality of dividing circuits, one dividing circuit also may be used. The reason is that the first dividing circuit and the determining circuit can be used to determine a frequency component included in an inputted music signal source as shown in Embodiment 1 and thus a plurality of adjusting circuits can be used to provide the same effect.
The respective structures of Embodiments 1, 2, and 3 can be provided by hardware or a digital signal processing by software or a combination thereof to perform the same control.
INDUSTRIAL APPLICABILITYAccording to the present invention, sources in which different frequency characteristics are recorded in specific channels such as DVD and CD can be reproduced with a good sound quality. Thus, the present invention can be advantageously used for a sound reproducing apparatus that can reproduce multiple channels.
Claims
1. A sound reproducing apparatus comprising:
- a music signal source;
- a dividing circuit formed of at least one filter for dividing the music signal source into prescribed bands;
- a determining circuit for determining a frequency included in the music signal source based on an output from the dividing circuit;
- an adjusting circuit formed of at least one filter for adjusting a frequency characteristic of the music signal source to a prescribed frequency characteristic; and
- wherein a signal adjusted to a prescribed frequency characteristic is outputted by controlling the switch circuit using an output from the determining circuit.
2. The sound reproducing apparatus according to claim 1, wherein
- the sound reproducing apparatus includes the plurality of dividing circuits, and
- the determining circuit receives signals having prescribed bands of the music signal source outputted from the plurality of dividing circuits.
3. The sound reproducing apparatus according to claim 1, wherein
- the sound reproducing apparatus includes the plurality of adjusting circuits.
4. The sound reproducing apparatus according to claim 1, wherein
- the sound reproducing apparatus includes the plurality of adjusting circuits and the plurality of dividing circuits, and
- the determining circuit receives signals having prescribed bands of the music signal source outputted from the plurality of dividing circuits.
Type: Application
Filed: Jun 8, 2006
Publication Date: Feb 26, 2009
Applicant: PANASONIC CORPORATION (Osaka)
Inventors: Kazuhisa Kotegawa (Osaka), Shinnosuke Nagasawa (Osaka)
Application Number: 11/913,725
International Classification: H03G 5/00 (20060101);